JP3322271B2 - Power supply and lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for controlling the output of an AC power supply by switching means and a lighting apparatus.

[0002]

2. Description of the Related Art As a power supply device of this type, a configuration as shown in FIG. 5 has been known.

In the power supply device shown in FIG. 5, a full-wave rectifier circuit 1 is connected to a commercial AC power supply E, and voltage dividing capacitors C1 and C2 are connected to output terminals of the full-wave rectifier circuit 1.
A parallel circuit of the transistor Q1, a resistor R1, R2, and a parallel circuit of the transistor Q2 and the resistors R3, R4 are connected in parallel with the voltage dividing capacitors C1, C2. Also, a parallel circuit of transistor Q1 and resistors R1, R2, transistor
Diodes D1 and D2 are connected in parallel with the parallel circuit of Q2 and the resistors R3 and R4, respectively.

A primary winding T1a of an output transformer T1 and an input winding of a control transformer T2 are connected between a connection point of the voltage dividing capacitors C1 and C2 and the resistors R1 and R2 and the collector of the transistor Q2. Line T2a is connected in series.

The first output winding T2b of the control transformer T2 is connected to the base of the transistor Q1 and the input winding T2a.
, And the second output winding T2c is connected to the base of the transistor Q2 and the negative electrode of the full-wave rectifier circuit 1.

Further, the output terminal of the full-wave rectifier circuit 1
Time constant 2 consisting of a series circuit of resistor R5 and capacitor C3
The connection point between the resistor R5 and the capacitor C3 is connected to the base of the transistor Q2 via the constant voltage element SBS, and the diode is connected via the diode D3.
It is connected to the connection point of D1 and diode D2. The time constant circuit 2 and the starting circuit 3 are controlled by the constant voltage element SBS.
Is configured.

The secondary winding T1b of the output transformer T1
Is connected to a low-voltage halogen lamp IL.

Then, the voltage of the commercial AC power supply E is rectified by the full-wave rectifier circuit 1, and a constant voltage element is supplied in accordance with the rectified pulsating flow.
The SBS outputs a pulse and operates the transistor Q2.

Then, the transistor Q1 and the transistor Q2 are turned on and off alternately to output a high-frequency alternating current, thereby lighting the low-voltage halogen lamp IL.

[0010]

However, once,
Even if the low-voltage halogen lamp IL is removed and the low-voltage halogen lamp IL is mounted again, the low-voltage halogen lamp IL cannot be turned on unless the commercial AC power supply E is once opened.

That is, when the low-voltage halogen lamp IL is removed, the impedance of the primary winding T1a of the transformer T1 is reduced.
Current increases, the current flowing through the transformer T1 decreases,
The voltage dividing capacitors C1 and C2 continue to be charged. When the voltage dividing capacitors C1 and C2 are charged and these voltage dividing capacitors C1 and C2 are charged, these voltage dividing capacitors C1 and C2 have a function as a smoothing capacitor, and the zero cross of the pulsating flow is lost.
The self-holding current of the constant voltage element SBS continues to flow and
Maintaining the state of being electrically connected to not set, in accordance with the pulsating flow path
No longer output. Therefore, transistor Q2 is that such not perform oscillation. After this, a low voltage halogen lamp
Even if IL is attached, the constant voltage element SBS is not reset.
Since pulse output is not performed, transistor
Q2 does not oscillate, and voltage is applied to the secondary winding T1b of the output transformer T1.
Is not induced. Therefore, the low-voltage halogen lamp IL
Has a problem that the light is not turned on unless the power supply is reset .

The present invention has been made in view of the above problems, and provides a power supply device and a lighting apparatus which can operate a load without resetting the power supply even if the load is removed and the load is attached again. The purpose is to:

[0013]

According to a first aspect of the present invention, there is provided a power supply apparatus comprising: a rectifier for rectifying an AC voltage of an AC power supply; a voltage dividing capacitor connected between outputs of the rectifying means; a switching means for supplying power to operate the load in accordance with pulsating output in connected to the rectifier means, the output is a predetermined value of the time constant circuit and the time constant circuit having a capacitor provided in parallel to the divided capacitor a switching element which gives an oN control signal before Symbol switching means upon reaching a holding current above the current
A starting circuit that maintains a conductive state when supplied .
Discharging means for discharging the charge charged in the voltage dividing capacitor and the capacitor of the time constant circuit in accordance with the pulsating current output by the rectifying means , wherein the load is connected
The voltage dividing capacitor and the time constant
Charged in the capacitor of the path is output by the rectifier
Discharge by the discharging means in accordance with the pulsating flow
Switching element turns on the switching means according to the pulsating flow.
Control signal, and power is supplied with the load removed.
When the load is attached while it is being supplied,
It supplies power .

[0014] Lighting device according to claim 2, wherein the housing a power supply device according to claim 1, wherein in the instrument body, the load is a low-voltage halogen lamp attached to the instrument body.

[0015]

According to the power supply device of the present invention, the electric charge charged in the voltage dividing capacitor is converted by the discharging means into the electric charge charged in the voltage dividing capacitor and the capacitor of the time constant circuit in accordance with the pulsating current outputted by the rectifying means. Even when the load is not connected, the electric charges charged in the voltage dividing capacitor and the capacitor of the time constant circuit are discharged by the discharging means in accordance with the pulsating flow output by the rectifying means, so that the voltage dividing capacitor is discharged.
Pulsating flow exists without functioning as capacitors, on-control signal to the switching means switching element in accordance with the pulsating flow
The load has been removed and power has been supplied.
After attaching the load that state, it supplies power to the load without power reset.

According to a second aspect of the present invention, there is provided a lighting apparatus, wherein the power supply device according to the first aspect is housed in an apparatus main body, and the low-voltage halogen lamp attached to the apparatus main body is turned on. The low-voltage halogen lamp can be turned on without resetting the power supply.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a lighting device according to an embodiment of the present invention. The same parts as those of the power supply device shown in FIG.

In FIG. 2, reference numeral 11 denotes a lighting fixture main body. The lighting fixture main body 11 has a spot lighting section 13 attached to a base 12 attached to a mounting surface such as a ceiling by a support post 14, A low voltage halogen lamp IL is mounted on the reflector 13 and is included in the reflecting mirror 15.

As shown in FIG. 1, a full-wave rectifier circuit 1 serving as a rectifier is provided inside the base 12 as shown in FIG.
The voltage dividing capacitor C1 and the voltage dividing capacitor C2 are connected to the output terminal side of the full-wave rectifier circuit 1. The voltage dividing capacitor C2 is connected in parallel with a discharging resistor R6 as a discharging means.
Is connected. And, in parallel with the voltage dividing capacitor C1 and the voltage dividing capacitor C2, a parallel circuit of a transistor Q1, a resistor R1 and a resistor R2 as switching means,
A transistor Q2 as switching means and a parallel circuit of resistors R3 and R4 are connected. In addition,
A half-bridge type inverter circuit is configured by the transistor Q1, the transistor Q2, the diode D1, the diode D2, and the like. Also, the transistor Q1, and a parallel circuit of the resistors R1 and R2, the transistor Q2,
A circulating diode D1 and a diode D2 are connected in parallel with the parallel circuit of the resistors R3 and R4, respectively.

An output transformer is connected between the connection point of the voltage dividing capacitor C1 and the voltage dividing capacitor C2 and the resistors R1 and R2 and the collector of the transistor Q2.
Primary winding T1a of T1 and input winding of transformer T2 for control
T2a is connected in series.

The first output winding T2b of the control transformer T2 is connected to the base of the transistor Q1 and the input winding T2a.
, And the second output winding T2c is connected to the base of the transistor Q2 and the negative electrode of the full-wave rectifier circuit 1.

Further, the output terminal of the full-wave rectifier circuit 1
A time constant circuit 2 composed of a series circuit of a resistor R5 and a capacitor C3 is connected. A connection point between the resistor R5 and the capacitor C3 is connected to the base of the transistor Q2 via a constant voltage element SBS as a switching element. It is connected to a connection point between the diode D1 and the diode D2 via the diode D3. Then, the starting circuit 3 is constituted by the time constant circuit 2 and the constant voltage element SBS.

Also, the secondary winding T1b of the output transformer T1
Is connected to a low-voltage halogen lamp IL.

Next, the operation of the above embodiment will be described.

First, the voltage of the commercial AC power supply E is rectified by the full-wave rectifier circuit 1 and the constant voltage element SB is supplied in accordance with the rectified pulsating current.
S outputs a pulse, and activates the transistor Q2 every time a predetermined value of the pulsating flow output is exceeded.

Then, the transistor Q1 and the transistor Q2 are turned on and off alternately to output a high-frequency alternating current, thereby lighting the constant voltage halogen lamp IL.

In this normal state, the electric charge charged in the capacitor C2 is transferred to the capacitor C2, the capacitor C3, the diode D3, the input winding T2a of the transformer T2, the primary winding T1a of the transformer T1, and the closed circuit of the capacitor C2. The voltage dividing capacitor C1 and the voltage dividing capacitor C2 do not function as a smoothing capacitor, and there is a zero cross of a pulsating flow.

On the other hand, a low-voltage halogen lamp IL
When the transformer T1 is removed from the secondary winding T1b of T1,
Since the impedance of the primary winding T1a of the transformer T1 increases, the current flowing through the primary winding T1a of the transformer T1 decreases, so that the transistor Q2 cannot be turned on and does not oscillate.

When the instantaneous voltage of the pulsating current becomes equal to or less than a predetermined value, the electric charge charged in the voltage dividing capacitor C2 is discharged to the discharge resistor R6.
Is discharged by On the other hand, the electric charge charged in the capacitor C3 is also discharged through the diode D3, the input terminal T2a of the transformer T2, the primary winding T1a of the transformer T1, and the discharge resistor R6. As described above, since the electric charges charged in the voltage dividing capacitor C2 and the capacitor C3 of the time constant circuit 2 are discharged by the discharging resistor R6, even if the low-voltage halogen lamp IL is removed, the pulsating current may be reduced. zero-crossing is formed, the constant voltage element SBS is a pulse output is on the control signal while being reset in accordance with pulsating.

Therefore, even if the low-voltage halogen lamp IL is detached while the low-voltage halogen lamp IL is removed, when the voltage of the capacitor C3 of the time constant circuit 2 exceeds a predetermined value, the constant-voltage element SBS is turned off. Since the transistor Q2 is operated by performing a pulse output with a reliable breakover, the low-voltage halogen lamp IL can be turned on without resetting the power supply.

As shown in FIG. 3, the discharging means can connect the discharging resistor R8 to the diode as shown in FIG. 4 even if the discharging resistor R8 is connected in parallel to both ends of the voltage dividing capacitors C1 and C2. The same effect can be obtained by connecting D3 in parallel.

[0032]

According to the first aspect of the present invention, even when the load is not connected, the electric charges charged in the voltage dividing capacitor and the capacitor of the time constant circuit are discharged in accordance with the pulsating current outputted by the rectifying means. in order to be discharged, on the control signal to the switching means switching element in accordance with the pulsating flow
The load has been removed and power has been supplied.
Even after mounting the load that state, it supplies power to the load without power reset.

According to the lighting apparatus of the second aspect, the power supply device of the first aspect is housed in the apparatus main body, and the low-voltage halogen lamp mounted on the apparatus main body is turned on. After that, the low-voltage halogen lamp can be turned on without resetting the power supply.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a lighting fixture of the present invention.

FIG. 2 is a perspective view showing an appearance of the lighting device.

FIG. 3 is a circuit diagram showing a part of a circuit according to another embodiment.

FIG. 4 is a circuit diagram showing a part of a circuit according to another embodiment of the present invention;

FIG. 5 is a circuit diagram showing a conventional lighting fixture.

[Explanation of symbols]

 1 Full-wave rectification circuit as rectification means 2 Time constant circuit 3 Starting circuit C1, C2 Voltage dividing capacitor C3 capacitor E Commercial AC power supply IL Low-voltage halogen lamp Q1, Q2 Transistors R6, R7, R8 as switching means As discharging means Discharge resistance SBS Constant voltage element as switching element

Claims (2)

(57) [Claims] 1. A rectifying means for rectifying an AC voltage of an AC power supply, a voltage dividing capacitor connected between outputs of the rectifying means, and an operation according to a pulsating current connected to the voltage dividing capacitor and outputted by the rectifying means. a switching means for supplying power to the loaded, on the control signal before Symbol switching means when the output of the time constant circuit and the time constant circuit having a capacitor provided in parallel to the divided capacitor reaches a predetermined value Switching element that provides a current greater than the holding current.
A starting circuit that maintains a conductive state when supplied, and discharging means for discharging electric charges charged in the voltage dividing capacitor and the capacitor of the time constant circuit in accordance with a pulsating current output by the rectifying means. , Even when the load is not connected,
Charge in the capacitor of the circuit and the time constant circuit
Is calculated by the discharging means according to the pulsating flow output by the rectifying means.
Discharges, and the switching element
To the switching means, and the load is removed.
And attach the load while power is supplied.
And a power supply for supplying power to the load . 2. A housing a power supply device according to claim 1, wherein in the instrument body, luminaire, wherein the load is a low-voltage halogen lamp attached to the instrument body.